Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1987-04-20

1988-11-29

Robinson, Ellis P.

Stock material or miscellaneous articles

Composite

Of polyamidoester

252 6254, 427128, 427131, 428328, 428379, 428694, 428900, G11B 5702

Patent

active

047881038

ABSTRACT:
A magnetic recording medium is described, comprising a non-magnetic support having provided thereon a magnetic layer containing ferromagnetic fine particles dispersed in a binder including a polyurethane resin containing (1) as a main polymer chain a polyester polyol containing an alcoholic and acid components comprising at least one of (A) at least one alcoholic component selected from alicyclic divalent alcohol and aromatic divalent alcohol in an amount of 50 mol % or more based on the total amount of alcoholic components or (B) at least one acid component selected from alicyclic dicarboxylic acid and aromatic dicarboxylic acid in an amount of 50 mol % or more based on the total amount of acid components, and (2) at least one polyisocyanate selected from tolylene diisocyanate, diphenyl-methane-4,4'-diisocyanate, isophrorone diisocyanate, dicyclohexylmethane-4,4'-diisocyanate, and p-phenylene diisocyanate in an amount of 5 mol % or more based on the total amount of all alcoholic components and all acid components, and further containing (3) a polar group selected from --SO.sub.3 M, --CO.sub.2 M, and --PO.sub.3 M.sub.2, wherein M represents an H, Na, or K atom, in an amount of from 0.03 to 2 wt % based on the total amount of the polyurethane resin.

REFERENCES:
patent: 4152485 (1979-07-01), Mizumura
patent: 4411957 (1983-10-01), Tokuda
patent: 4420531 (1983-12-01), Tokuda
patent: 4521486 (1985-06-01), Ninomiya
patent: 4529661 (1985-07-01), Ninomiya
patent: 4613545 (1986-09-01), Chubachi
patent: 4615949 (1986-10-01), Yoda
patent: 4634633 (1987-01-01), Ninomiya
patent: 4637959 (1987-01-01), Ninomiya
patent: 4656089 (1987-04-01), Ninomiya
patent: 4659626 (1987-04-01), Fukushima
patent: 4666784 (1987-05-01), Inukai
patent: 4686145 (1987-08-01), Honda

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